Adjustable Armrest Assembly with Crank Mechanism for Material Handling Vehicles
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Solution Overview
Problem
Existing armrests in material handling vehicles are not easily adjustable, limiting operator comfort and requiring costly manufacturing due to fixed positioning.
Innovation Solution
An adjustable armrest assembly with a rising platform, nut aperture, and rod assembly, including a crank mechanism and smart device, allowing vertical translation and locking into various positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed armrest is used, then manufacturing cost is reduced, but operator comfort is compromised due to inability to adjust to different operator preferences
Solution Approach 1:
The armrest assembly is designed with dynamic adjustability, allowing the armrest to be repositioned vertically along the post between predetermined stops. This dynamic feature enables adaptation to different operator preferences while maintaining a relatively simple fixed-post structure, thus balancing manufacturing cost with adaptability.
Solution Approach 2:
The armrest position is changed by varying the vertical parameter along the post, with predetermined stops at different heights. This allows the armrest to assume different positions to accommodate various operator comfort requirements while using a simple fixed post structure, resolving the contradiction between manufacturing simplicity and position adaptability.
2Adaptability or versatility
If an adjustable armrest mechanism is added, then operator comfort is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The armrest assembly incorporates a dynamic adjustment capability where the armrest can be manually repositioned along the post between predetermined stops. This provides operator comfort through adjustability while avoiding complex automated mechanisms, thus improving adaptability without excessively increasing device complexity.
Solution Approach 2:
The adjustment mechanism is segmented into discrete predetermined stops at different heights along the post. The armrest can be positioned at any of these stops, providing multiple adjustable positions without requiring a continuous complex adjustment mechanism. This segmentation simplifies the overall device complexity while maintaining adjustability for operator comfort.
3Adaptability or versatility
If telescoping pipes with apertures and pins are used for adjustment, then armrest position can be changed, but the adjustment mechanism becomes difficult to operate and lock securely
Solution Approach 1:
The armrest assembly allows dynamic repositioning along the post with predetermined stops that provide secure locking. The design simplifies operation by eliminating complex aperture-and-pin mechanisms, making adjustment easier while maintaining secure positioning through the stop-based locking system.
Solution Approach 2:
The complex aperture-and-pin adjustment mechanism is extracted and replaced with a simpler predetermined stop system. The armrest can be freely positioned along the post and locked at predetermined stops, removing the cumbersome aperture alignment and pin insertion steps while maintaining secure locking capability, thus improving ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances operator comfort by providing adjustable armrest height without complex manufacturing costs, allowing multiple positions and easy locking, suitable for material handling vehicles.
Implementation Method 1
a spring positioned along the crank rod and biased by the flanged bushing toward the rotation stops
Implementation Method 2
a rod assembly including a threaded rod and a flanged bushing
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Provided are systems and methods for adjusting an armrest assembly, the assembly comprising an armrest that includes an armrest pad, a rising platform having a nut aperture, a nut positioned within the nut aperture. The assembly further includes a rod assembly coupled with the armrest, an adjustment mechanism for raising or lowering the armrest, and may include one or more rotation stops coupled with a stationary plate.